wilson



(No Model.) v

W. S.' WILSON.

y BACK PBDALING BRAKE. No. 597,347. Patented Jan. 11,1898.

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'WC'CHQSLSQS /ifen (bfi of a stationary friction-drum carried by the VLLIAM S. WILSON, OF BRANTFOVRD,

PATENT @Erica CANADA, ASSIGNOR TO THE GOOLD BICYCLE COMPANY, LIMITED, OF SAME PLAGE.

BACK-PEDAL ING BRAKE.

SPECFICATION forming part of Letters Patent No. 597,347, dated January 1l, 1898.

Application filed March 15, 1897.

To @ZZ whom t may concern.-

Be it known that I, VVILLTAM SANEIELD WiLs0N, manufacturer, of the city of Brantford, in the county of Brant and Province of Ontario, Canada, have invented a certain new` and Improved. Brake for Bicycles and Similar Vehicles, of which the following is a specification.

The object of my invention is to devise a light, compact, simple, and efficient brake which can be put into action bythe pressure of back-pedaling; and it consists, essentially,

axle of the rear wheel and a band adapted to move aV set of rollers or their equivalents np inclined planes when back pressure ,is applied to the driving-sprocket, so to produce friction against the inside of the said drum, the whole being constructed in detail substantially as hereinafter more specifically described and then definitely claimed.

Figure l isaperspective view showing my improved brake partially broken away to show the interior construction. Fig. 2 is a sectional front elevation of the same. Fig. 3 is aside elevation of the same, partially in section. Figs. a, 5, and 6 are sideelevations of a portion of an alternative form of my invention.

In the drawings like letters of reference indicate corresponding parts in the different figures. 1

A is the hub of the rear Wheel, on which is loosely sleeved the sprocket-Wheel B. Surronndin g the hub, outside the sprocket-Wheel, is a divided friction-band C, which has a lug o. formed thereon,\vhich tits into a correspondinglyshaped recess in the sprocket-wheel B.

D is a iianged Washer screwed Within the end of the hub A and bearing against the split friction-band C,so as to retain it in po sition.

The sprocket-wheel B is held in place on the inner side by means of a ring E, formed on or connected to the hub.

F is a friction-drum sleeved upon the axle G, its rim Z7 inclosing the divided frictionband C and extending inwardly close to the sprocket-Wheel B. Will be seen from the drawings, the friction-band andfriction-drum are barely in contact under normal condi- Seriel No. 627,714L (No model.)

tions. The end of the frictiondrum is in contact With the cone H, so that the frame I may be clamped securely between the drum F and the nut J.

K is the pin, formed on or connected to the drum F. This pin normally lies against a portion of the frame I, as shown, to prevent thedruni being rotated in the direction in which the` hub may be moving. y

L are a series of small rollers set half in recesses c, formed in the frictionband C, and partly in recesses d, formed in the hub A. Each recess CZ in the hub is formed with an inclined plane e, extending from its bottom to the surface of the hub in a direction reverse to that of the movement of the hub. From this construction it follouf's that the friction-band and the hub Willrevolve as one when power is applied to the sprocket-Wheel 7o to drive it in the direction indicated by arrow. If, however, the strain is reversed, as in the action of baek-pedaling, the rollers L Will ride up the inclined planes c and force the friction-band C into close contact With 7 5 the inside surface of the rim b of the drum F, thus applying' a very efficient brake to prevent the continued rotation of the hub a, and consequently of the Wheel of which it forms a part. The force with which the split 8o friction-band O is pressed against the rim of the friction drum depends partly on the strength with which the rider of the Wheel back-pedals and partly on the angle of the inclined plane e, which angle may be varied S5 to suit different conditions. Y

It is evident that the rollers L may be made integral with the friction-band, as shown in Fig. 5, or that the inclined planes e might be formed on the friction-band, if so desired, as 9o shown in Fig. 6 5 but all such variations would fall Within the scope of my invention.

The band O in my brake performs two functions-iirst, that of moving the rollers L up the inclined planes e, and, second, that of taking the Wear caused by friction against the drum.

The first function is the most important, and

it will be as effectively performed if the band be divided between eachv pair of rollers (see Fig. 2) as if divided at one point only7 as in zoo Fig. 1. The second function not beingas im* portant as the first, the band O maybe so con- 3o a Wheel,oneofsaid partshavingagroove there- 'inV with one of-its sides forming an inclined f plane withan abrupt shoulder at one end,y

structed as to permit therollers L themselves to yconne intocontactwith the inside surface Vofthe drum.V 'lhis form is Vshown in Fig. 4,

where slots are cut through the band through YWhich the rollers may play.V It is evident that `motion `of ythe Vband inV the'direction'indicated by arrow Will cause the balls Vor rollers to Y press upon .the dru-m,fwhereas Vmotion of ythe Vthat my brake .is exceedingly simple,V lightjV and strong, and also 'that it applies no strainV VWhatever upon the bearings,Y the only effect f 1 5. Y of its applicationbeingto put a twisting` strain band in the other direction will lock the rband and the hub together, so that they will revolve as one. f f f Y From the above description it'will be seen upon the Shub' andV the wheel.. 'SAs it 'is' apg plied simply by the action of back-pedaling,

Vno unsightly Vor cumbersome 4gear is lrequired for its operation7 and any degree of Vfriction 1 maybe obtained between the friction-bandV randthe drum, sofas to yeither merely retard Y -entirely. c 2.5.4

theinotion 'of the WheelY or stop That I claiin as inyinvention is-'- 1. In a brake for bicycles, and in combina'- t'lon with the wheeland hub thereof, afstak' tionary.frictioned'rum carried bythe aXle'of said Wheel, a sprocketwvheel loose on said hub, a'band having a connection with said sprocketand a VWedgiing device carried Lby another 'of said parts and Working in said groove and yarranged Vwhen inthe groove to forni a posi- Ytive'drivin'g medium and when'5 on 'the in-y clined plane to create friction on said sta-4 tionary drum, substantially as described.

2. In a brake for bicycles, andin combination with the wheel and hub thereof, a stationary friction-drum carried by the axle of said Wheel, a sprocket-Wheel loose on said hub, a friction-band having a connection with said its 'rotationV sprocketwheel, a groove in said'hub having` oneo't its sides forming an inclined plan e with an abruptshoulder at itsend, a wedgingdekvice carried by said Vfriction-band and inter-y posed' between said friction-band and hub and yWorking yinsaid Vgroove Vand arranged' when in the groove to forma positive driving f medium and when on the inclined plane to Y create friction hetweensaid friction-band and f stationary drum, substantially as described.

3. In a brake for bicycles and in combinaxtion withY the Wheel and hub 4thereof5 a rstationary friction-drum carried by the axle of Y S said Wheel, a sprocket-wheel loose on said hub, a friction-band having Va connectionwith said sprocket-Wheel, recesses in said hub and fric- Vtion-band, one set 'of said" recesses having theirfsides forming inclined planes, and roll-Y ers placed in the recesses between said frie- V tiomband and hub and acting as apositive 'driving5 medium when at one end of the grooves and when on the inclined planes actingtc; force thc friction-band against the fric- Vtioirdrum, substantially asdescribed.

tofV4 4.111 a bicycle, Van axle and a stationary Y druin carried bythe f saidV aXleAnr combination withV a hub and Va divided friction-band supported by the hub;Y a flanged Washer` screwed Within the hubV and adapted Vto `retain thesaid Vband upon the hub; razsprocket1 VWheel loose on the hubl and connected with Y the said,frictiombandgand one or'inorerrollers lying partly in recesses in theV Vsaid friction-band and partly inreces'ses inthe hub, i Y Y an inclined plane being formedleading from lthe-bottom of'each `recess Yin the Vhub to its ff surface, substantially .as and'for the purpose specified.

Brantford, February 19, 1S97.

VILLIAM S. VILSON.

In presence of- ANDREW L. BAIRD, S. G. MACKLIN. 

